diff --git a/cmd/raidz_test/raidz_test.c b/cmd/raidz_test/raidz_test.c
index 34f3f6f1ccc6..195026d3a7ab 100644
--- a/cmd/raidz_test/raidz_test.c
+++ b/cmd/raidz_test/raidz_test.c
@@ -937,7 +937,7 @@ run_sweep(void)
 		opts = umem_zalloc(sizeof (raidz_test_opts_t), UMEM_NOFAIL);
 		opts->rto_ashift = ashift_v[a];
 		opts->rto_dcols = dcols_v[d];
-		opts->rto_offset = (1 << ashift_v[a]) * rand();
+		opts->rto_offset = (1ULL << ashift_v[a]) * rand();
 		opts->rto_dsize = size_v[s];
 		opts->rto_expand = rto_opts.rto_expand;
 		opts->rto_expand_offset = rto_opts.rto_expand_offset;
diff --git a/lib/libefi/rdwr_efi.c b/lib/libefi/rdwr_efi.c
index 3501c3ea391c..739219e0410f 100644
--- a/lib/libefi/rdwr_efi.c
+++ b/lib/libefi/rdwr_efi.c
@@ -1362,7 +1362,7 @@ efi_write(int fd, struct dk_gpt *vtoc)
 	if (NBLOCKS(vtoc->efi_nparts, vtoc->efi_lbasize) < 34) {
 		dk_ioc.dki_length = EFI_MIN_ARRAY_SIZE + vtoc->efi_lbasize;
 	} else {
-		dk_ioc.dki_length = NBLOCKS(vtoc->efi_nparts,
+		dk_ioc.dki_length = (len_t)NBLOCKS(vtoc->efi_nparts,
 		    vtoc->efi_lbasize) *
 		    vtoc->efi_lbasize;
 	}
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index 54cfb4bd3d04..936bcb5e3efb 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -5136,7 +5136,7 @@ arc_adapt(int bytes, arc_state_t *state)
 		if (!zfs_arc_p_dampener_disable)
 			mult = MIN(mult, 10); /* avoid wild arc_p adjustment */
 
-		arc_p = MIN(arc_c - arc_p_min, arc_p + bytes * mult);
+		arc_p = MIN(arc_c - arc_p_min, arc_p + (uint64_t)bytes * mult);
 	} else if (state == arc_mfu_ghost) {
 		uint64_t delta;
 
diff --git a/tests/zfs-tests/cmd/stride_dd.c b/tests/zfs-tests/cmd/stride_dd.c
index 732ac9f47268..6af45c3e8aeb 100644
--- a/tests/zfs-tests/cmd/stride_dd.c
+++ b/tests/zfs-tests/cmd/stride_dd.c
@@ -156,7 +156,7 @@ main(int argc, char *argv[])
 	}
 
 	if (seek > 0) {
-		if (lseek(ofd, seek * bsize, SEEK_CUR) == -1) {
+		if (lseek(ofd, (uint64_t)seek * bsize, SEEK_CUR) == -1) {
 			perror("output lseek");
 			exit(2);
 		}
@@ -195,11 +195,13 @@ main(int argc, char *argv[])
 		}
 
 		if (stride > 1) {
-			if (lseek(ifd, (stride - 1) * bsize, SEEK_CUR) == -1) {
+			if (lseek(ifd, (stride - 1ULL) * bsize,
+			    SEEK_CUR) == -1) {
 				perror("input lseek");
 				exit(2);
 			}
-			if (lseek(ofd, (stride - 1) * bsize, SEEK_CUR) == -1) {
+			if (lseek(ofd, (stride - 1ULL) * bsize,
+			    SEEK_CUR) == -1) {
 				perror("output lseek");
 				exit(2);
 			}